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RITO 640401 Cylinder Block M5X250 SY500H SY465H 640401 Hydraulic Pump Cylinder Block Rotor Group Excavator Pump Parts

Loss of rotation torque and violent swing vibrations on your SY500H mean internal motor block fatigue. Blown cylinder faces drop holding pressures, causing dangerous carriage drift on steep slopes.

  • Item NO.:

    640401
  • Order(MOQ):

    1
  • Payment:

    T/T, WESTERN UNION, CHINESE BANK,PAYPAL
  • Product Origin:

    JAPAN
  • Lead Time:

    2-3 DAYS
  • Product Details

Secure fluid slewing power with this heavy-duty SY500H M5X250 swing motor cylinder block. Matching 640401, this premium rotor group ensures stable torque multiplication for heavy mining equipment.

640401 Cylinder Block

 
Product Specifications

Part Number  640401 / M5X250
Part Name Swing Slewing Motor Cylinder Block Rotor Group Component
Compatible Brand Tongmyung
Applicable Models SY500H, SY465H Heavy Mining Excavators
Application Excavator hydraulic system
Material High‑strength Alloy Steel
Product Color Matte Steel Grey
Working Temperature -25°C to 115°C
Key Function Rotational Kinetic Energy Conversion and Mechanical Swing Braking Fluid Containment
Condition 100% New, Aftermarket / OEM Quality
Packaging Wooden Case/Reinforced Carton/Neutral Packing / Customized Box

 

Key Features & Advantages


Precision

High-Strength Piston Guide Sleeves

Maintain absolute axial piston alignment under intense lateral torque forces during uphill slewing.

Leak-Free

Nitride Hardened Steel Matrix

Resists high-velocity fluid erosion to prolong overall service limits across multi-shift mining projects.

Direct Fitment

Optimized Fluid Timing Ports

Reduce internal pressure drop losses to maximize overall hydraulic energy efficiency and cut fuel burn.

Rigorous Testing

 Multi-Tier Quality Options

We provide Original, OEM, and Premium Aftermarket grades, allowing distributors to meet diverse client budgets and performance needs.

 

Excavator Hydraulic Part

FAQ


Q: What direct symptoms indicate that an M5X250 swing motor block face has sustained micro-cracking?
A: The upper excavator body will shudder violently during deceleration, or drift past target stops when levers center.
 
Q: What critical step must field mechanics execute when dropping this new 640401 block onto the drive shaft spline?
A: Mechanics must inspect the shaft splines for twist deflection and pre-fill the motor housing with clean fluid.
 
Q: Are individual pistons and set plates available to complete this 50-ton class swing motor overhaul?
A: Yes, we provide full supporting sub-components including standard pistons, return plates, and thrust guides.
 
Q: How does the bimetallic bonding process ensure the copper face does not separate from the steel core under heavy loads?
A: The copper layer is fused under extreme heat and high pressure to create an unbreakable molecular bond at the interface.
 
Q:  What quality options are available?

A: We provide original, OEM, and high-quality aftermarket versions with stable supply capability.

 

Q:Why Choose RITO?
A:Listed Factory
   Stable&Reliable Quality
   OEM Factory for Chinese Top Excavator Brands
   Supplier to Fortune 500 Companies

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If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

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Leave A Message
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

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